package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.annotation.AutoFill;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //像菜品表插入一项数据
        dishMapper.insert(dish);
        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors!=null && flavors.size()>0){
            //将主键值赋给口味表
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品的分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //配置pageHelper
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    public void deleteBatch(List<Long> ids) {
        //菜品如果在启售状态无法被删除
        for (Long id : ids) {
            Dish dish = dishMapper.selectById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        
        //菜品关联了套餐无法被删除
        List<Long> setmealIds = setmealDishMapper.getSetmealIdByDishId(ids);
        if(setmealIds !=null && setmealIds.size() > 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //批量删除菜品
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //删除菜品相关口味
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //优化 用循环批量删除会产生大量的sql语句 对性能来说并不好
        //批量删除菜品
        dishMapper.deleteByIds(ids);
        //删除菜品相关口味
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品
     * @param id
     * @return
     */
    @Override
    public DishVO selectById(Long id) {
        DishVO dishVO = new DishVO();

        //查询菜品的基本信息
        Dish dish = dishMapper.selectById(id);

        //查询菜品对应的口味信息
        List<DishFlavor> dishFlavors = dishFlavorMapper.selectByDishId(id);

        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }


    /**
     * 修改菜品及其对应的口味
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        //修改菜品基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);
        //删除菜品相关的口味信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //新增菜品相关的口味信息
        List<DishFlavor> dishFlavors = dishDTO.getFlavors();
        if (dishFlavors != null && dishFlavors.size()>0){
            dishFlavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(dishFlavors);
        }
    }

    /**
     * 根据分类id查询菜品信息
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                        .categoryId(categoryId)
                        .status(StatusConstant.ENABLE)
                        .build();
        return dishMapper.list(dish);
    }

    /**
     * 菜品的启售和停售
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }

    /**
     * 根据categoryid查询相关菜品及其口味数据
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {

        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.selectByDishId(d.getId());
            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
